package com.acp.util;

import java.net.InetAddress;
import java.util.UUID;
/**
 * All rights Reserved, Designed By 姑苏区政府大数据中心
 *
 * @version V1.0
 * @Title: null.java
 * @Package com.dci.controller.construction
 * @Description: UUIDBuild
 * @author: 张星亮
 * @date: 2019/4/5
 * @Copyright: 2019 姑苏区政府大数据中心. All rights reserved.
 * 注意：本内容仅限于姑苏区政府大数据中心内部传阅，禁止外泄以及用于其他的商业目
 */
public class UUIDBuild {
    private String sep = "";

    private static final int IP;

    private static short counter = (short) 0;

    private static final int JVM = (int) (System.currentTimeMillis() >>> 8);

    private static UUIDBuild uuidgen = new UUIDBuild();

    static {

        int ipadd;
        try {
            ipadd = toInt(InetAddress.getLocalHost().getAddress());
        } catch (Exception e) {
            ipadd = 0;
        }
        IP = ipadd;
    }

    public static UUIDBuild getInstance() {
        return uuidgen;
    }

    public static int toInt(byte[] bytes) {
        int result = 0;
        for (int i = 0; i < 4; i++) {
            result = (result << 8) - Byte.MIN_VALUE + (int) bytes[i];
        }
        return result;
    }

    protected String format(int intval) {
        String formatted = Integer.toHexString(intval);
        StringBuffer buf = new StringBuffer("00000000");
        buf.replace(8 - formatted.length(), 8, formatted);
        return buf.toString();
    }

    protected String format(short shortval) {
        String formatted = Integer.toHexString(shortval);
        StringBuffer buf = new StringBuffer("0000");
        buf.replace(4 - formatted.length(), 4, formatted);
        return buf.toString();
    }

    protected int getJVM() {
        return JVM;
    }

    protected synchronized short getCount() {
        if (counter < 0) {
            counter = 0;
        }
        return counter++;
    }

    protected int getIP() {
        return IP;
    }

    protected short getHiTime() {
        return (short) (System.currentTimeMillis() >>> 32);
    }

    protected int getLoTime() {
        return (int) System.currentTimeMillis();
    }

    public String generate() {
        return new StringBuffer(36).append(format(getIP())).append(sep).append(
                format(getJVM())).append(sep).append(format(getHiTime()))
                .append(sep).append(format(getLoTime())).append(sep).append(
                        format(getCount())).toString();
    }

    public static void main(String[] str) {

        // 得到一个序号
        System.out.println(getUUID());

        // 一次得到多个序号
        String[] UUID_s = getUUID(10);
        for (int i = 0; i < UUID_s.length; i++) {
            System.out.println(UUID_s[i]);
        }
    }

    // 得到一个序号
    public static String getUUID() {
        String s = UUID.randomUUID().toString();
        return s.substring(0, 8) + s.substring(9, 13) + s.substring(14, 18)
                + s.substring(19, 23) + s.substring(24);
    }

    /**
     * 一次得到多个序号
     *
     * @param number int 需要获得的序号数量
     * @return String[] 序号数组
     */
    public static String[] getUUID(int number) {
        if (number < 1) {
            return null;
        }
        String[] ss = new String[number];
        for (int i = 0; i < ss.length; i++) {
            ss[i] = getUUID();
        }
        return ss;
    }

}
